1
Hiroshi Yasuda, Fumio Kanaya: Interframe coding apparatus. Nippon Telegraph and Telephone Public Corporation, Sughrue Rothwell Mion Zinn and Macpeak, September 6, 1977: US04047221 (111 worldwide citation)

In interframe coding apparatus in which an input signal is encoded by an interframe coder and its output code is written in a buffer memory, and is read out therefrom at a constant bit rate, a variable characteristics comb filter is provided at a stage preceding the interframe coder. The period of t ...


2
Kiyoshi Nosu, Hideki Ishio, Tetsuya Miki: Optical multiplexer and demultiplexer. Nippon Telegraph and Telephone Public Corporation, Armstrong Nikaido Marmelstein & Kubovcik, January 6, 1981: US04244045 (110 worldwide citation)

An optical multiplexer and/or optical demultiplexer for multiplexing and/or demultiplexing a plurality of wavelengths comprises a plurality of optical filters each of which transmits a predetermined wavelength and reflects other wavelengths, said optical filters being arranged so that an optical bea ...


3
Hideto Kakihara, Kenichi Hiratsuka, Yoji Shibata, Wataru Kosuge: Picture/audio signal transmission system. Nippon Telegraph and Telephone Public Corporation, Hitachi, Craig & Antonelli, February 17, 1981: US04251691 (105 worldwide citation)

A center-to-end type information service system utilizing the public telephone networks that are fundamental communication media of nation-wide scale is disclosed in which desired information is requested from the terminal side to the center by means of a telephone set or simplified keyboard and the ...


4
Fumiyuki Adachi: Diversity system. Nippon Telegraph and Telephone Public Corporation, Burgess Ryan and Wayne, February 27, 1979: US04142155 (91 worldwide citation)

A common baseband digital signal is applied to a plurality of frequency modulators generating frequency modulated signals the carrier frequencies of which are equal to that of a common reference frequency oscillator, and the peak frequency deviations of the frequency modulated signals are made sligh ...


5
Yoshi Sugiyama, Keisuke Kataoka: Programmable logic array arrangement. Nippon Telegraph and Telephone Public Corporation, Charles E Pfund, June 10, 1980: US04207556 (81 worldwide citation)

The programmable logic array arrangement comprises a plurality of cell units formed on a semiconductor substrate and wiring means for interconnecting the cell units. Each cell unit comprises a plurality of electronic elements such as resistors, transistors and diodes which are necessary to form logi ...


6
Masafumi Tanimoto, Nobuaki Ieda, Masato Wada: Integrated circuit having spare parts activated by a high-to-low adjustable resistance device. Nippon Telegraph and Telephone Public Corporation, Charles W Helzer, August 16, 1983: US04399372 (67 worldwide citation)

Disclosed is a semiconductor integrated circuit device comprising a semiconductor chip including a plurality of elements constituting multi-functional circuits and a control signal generating circuit incorporated within the semiconductor chip. The control signal generating circuit includes a variabl ...


7
Tatsuo Izawa, Tadashi Miyashita, Fumiaki Hanawa: Continuous optical fiber preform fabrication method. Nippon Telegraph and Telephone Public Corporation, Sughrue Rothwell Mion Zinn and Macpeak, December 13, 1977: US04062665 (66 worldwide citation)

A refractory starting member is rotated and, at the same time, moved along the axis of rotation. A glass raw material for the formation of the core of a porous preform and consequently an optical fiber preform is introduced into a high temperature portion near the tip of a high temperature burner fr ...


8
Takao Matsumoto: Optical nonreciprocal device. Nippon Telegraph and Telephone Public Corporation, Frishauf Holtz Goodman & Woodward, December 16, 1980: US04239329 (65 worldwide citation)

The optical nonreciprocal device is used to optically couple together two opposed optical fibers. The light from one optical fiber is separated into ordinary ray and extraordinary ray by a first birefringent crystal member. The separated ordinary and extraordinary rays are subject to a total of 90.d ...


9
Takanori Utano, Masayuki Sakamoto, Yoshikazu Takayama: Mobile radio communication control system for preventing erroneous reception of control signals. Nippon Telegraph and Telephone Public Corporation, Nippon Electric, Sughrue Rothwell Mion Zinn and Macpeak, March 13, 1979: US04144409 (64 worldwide citation)

A mobile radio communication system utilizes message channels of the same frequencies in separate geographic zones. Also, zones utilizing the same message channels are assigned distinguishing control codes which are transmitted with control signals to prevent control signals related to one zone from ...


10
Masao Shimizu, Takashi Tokuno, Kohji Ishikawa, Naoaki Narumi, Osamu Ohguchi: Test pattern generating apparatus. Nippon Telegraph and Telephone Public Corporation, Takeda Riken Kogyo Kabushikikaisha, Staas & Halsey, October 6, 1981: US04293950 (64 worldwide citation)

A test pattern generating apparatus in which a microprogram describing a test pattern to be generated is read for interpretation and execution, address and data patterns are generated by arithmetic operations and a memory control signal is produced, the address and data patterns and the memory contr ...